Possible to have a 3500 Dually Truck as a TOAD vehicle?

For your calculations, my dually weighs 8,800 per the CAT scale. Owner's manual says you can flat tow a Chevy Silverado so long as it has 4-wheel drive.

Most diesel pushers have a 10,000 tow rating but you really got to check the numbers on the cheaper ones to learn if they really can. As I recall, the American Coach series has/had a 15,000 tow rating. We had a Super C at my dealership with a 20,000 tow rating, so they're out there.